Back when I used to deer hunt at every opportunity I was in a stand one day and really had to go..climbed down and walked about 100 yards away and kicked out a place and wet it down and returned to my stand...a while later a good buck was coming straight for me..I got ready for the shot with my bow but he stopped and stared for a while and then turned and went to the exact spot I had used and scraped it out some more and peed in it..after that I used the technique for my "secret weapon"..worked just as well or better than the store bought stuff.